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Question
if `[[9,-1,4],[-2,1,3]]=A+[[1,2,-1],[0,4,9]]`, then find the matrix A.
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Solution
`[[9,-1,4],[-2,1,3]]=A+[[1,2,-1],[0,4,9]]`
`A=[[9,-1,4],[-2,1,3]]-[[1,2,-1],[0,4,9]]`
`A=[[9-1,-1-1,4+1],[-2-1,1-4,3-9]]`
`A=[[8,-3,5],[-2,-3,-6]]`
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